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Dogfish Sharks - Photo (c) Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes, some rights reserved (CC BY-NC-SA) CC
Dogfish Sharks (Family Squalidae) Info
The Squalidae, also called dogfish sharks or spiny dogfishes, are a family of sharks in the order Squaliformes. They have two dorsal fins, each with smooth spines, but no anal fin, and their skin is generally rough to the touch. Unlike virtually all other shark species, dogfish sharks possess venom which coats their dorsal spines – this venom is mildly toxic to humans. (Wikipedia)
Gulper Sharks - Photo D Ross Robertson, no known copyright restrictions (public domain) PD
Gulper Sharks (Genus Centrophorus) Info
Centrophorus is a genus of squaliform sharks. These deep-water sharks, found in temperate and tropical oceans throughout the world, are characterized by grey or brown bodies, large green eyes, and spines on both dorsal fins. These spines give them their name, from Greek κεντρον, kentron meaning "thorn" and φέρειν, pherein meaning "to bear". (Wikipedia)